This is a brand new 20X Infinity Plan Achromatic microscope objective lens. It is an International DIN/JIS lens. It fits common size (DIN/JIS standard) compound / biological microscopes. We also have 4X, 10X, 40X and 100X Plan objective lenses available. Give your microscope a boost with greater power & clarity at a fraction of cost. Your satisfaction is guaranteed or your money back.